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Is Castle Hill, CA tap water safe?

East Bay MUD serves Castle Hill, by EPA’s records. Here is what EPA’s and California’s records show for it, against the legal limits and the stricter health goals.

Matched to your utility using EPA records.

The short answer

East Bay MUD serves Castle Hill. In EPA’s and California’s records it has 1 result above the health goal, and no health-based violation since 2016.

The worst: Uranium at 5.3 ppb, above the health goal. Health goals are stricter than legal limits and are not enforced.

The water from East Bay MUD is soft to moderately hard depending on the source, 17 to 120 mg/L (1 to 7 grains per gallon). How California’s water compares.

Some homes in a town are on private wells or a small system of their own. The name on your water bill tells you which is yours.

MUD stands for municipal utility district, a local water and sewer district common in Texas.

Water testing near Castle Hill

A utility tests the water it sends out. A test of your own tap shows what your pipes add, and on a private well it is the only test there is. It takes a lab California certifies.

The 3 labs California certifies closest to Castle Hill, in a straight line. Call first: certification is test by test, and not every lab takes samples from homeowners.

  • EMSL Analytical Inc.

    San Leandro, CA · about 12 miles

    Certified for asbestos

    (510) 895-3675

  • Alpha Analytical Laboratories, Inc.

    Livermore, CA · about 13 miles

    Certified for bacteria

    (707) 769-3128

  • McCampbell Analytical, Inc.

    Pittsburg, CA · about 13 miles

    Certified for bacteria, nitrate, lead and copper, metals, minerals and other inorganics, organic chemicals, disinfection byproducts, PFAS

    (925) 252-9262

All 145 certified labs for California

ZIP codes in Castle Hill

Which ZIP codes are in Castle Hill: Census 2020 relationship files. Which utilities serve them, and how many people: EPA SDWIS and EPA’s service area map. Each utility’s results: EPA UCMR 5, EPA SDWIS, and EPA’s and the state’s compliance monitoring, as its report lists them. How they are measured: methodology. Certified labs: California State Water Resources Control Board, ELAP accredited laboratories and their fields of accreditation; distances from the Census 2020 ZIP code tabulation area gazetteer.

Near Castle Hill

Other towns in Contra Costa County with a page of their own.

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